public XMLComparePreferencePage() {
    super();

    fIdMaps = new HashMap();
    XMLPlugin plugin = XMLPlugin.getDefault();
    HashMap PluginIdMaps = plugin.getIdMaps();
    Set keySet = PluginIdMaps.keySet();
    for (Iterator iter = keySet.iterator(); iter.hasNext(); ) {
      String key = (String) iter.next();
      fIdMaps.put(key, ((HashMap) PluginIdMaps.get(key)).clone());
    }
    fIdMapsInternal = plugin.getIdMapsInternal();

    fIdExtensionToName = new HashMap();
    HashMap PluginIdExtensionToName = plugin.getIdExtensionToName();
    keySet = PluginIdExtensionToName.keySet();
    for (Iterator iter = keySet.iterator(); iter.hasNext(); ) {
      String key = (String) iter.next();
      fIdExtensionToName.put(key, PluginIdExtensionToName.get(key));
    }

    fOrderedElements = new HashMap();
    HashMap PluginOrderedElements = plugin.getOrderedElements();
    keySet = PluginOrderedElements.keySet();
    for (Iterator iter = keySet.iterator(); iter.hasNext(); ) {
      String key = (String) iter.next();
      fOrderedElements.put(key, ((ArrayList) PluginOrderedElements.get(key)).clone());
    }

    fOrderedElementsInternal = plugin.getOrderedElementsInternal();
  }